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JAMB Physics 2006 Question 16

Question 16

Work, Energy and Power

An engine of a car of power 80 kW moves on a rough road with a velocity of 32 ms−1. The force required to bring it to rest is

  1. A.2.50 × 105 N.
  2. B.2.50 × 103 N.
  3. C.2.56 × 106 N.
  4. D.2.80 × 103 N.
Show the answer and explanation

Answer: B (2.50 × 103 N.)

Explanation

Power = force × velocity, so F = P/v = 80 000 ÷ 32 = 2500 N = 2.50 × 103 N.